DevKit vs JSON Viewer

DevKit puts 30 developer utilities in your pocket — and every one runs entirely on your device. Stop juggling browser tabs. Stop pasting production tokens into random websites. Format JSON, decode a JWT, test a regex, or convert a timestamp on a train, on a plane, or inside a locked-down corporate network. YOUR WORK STAYS ON YOUR DEVICE > Every tool runs locally. The JSON you paste, the token you decode, the certificate you inspect — none of it is uploaded to a server, and none of it is visible to us. > All 30 tools work with no internet connection. > No account, no sign-up, no email required. FORMATTERS > JSON Formatter: Beautify or minify JSON with error highlighting and tree view > HTML Formatter: Beautify, minify, and preview HTML with live rendering > CSS Formatter: Format and validate CSS with syntax highlighting > JS Formatter: Format and minify JavaScript > XML Formatter: Format and validate XML documents > SQL Formatter: Format and validate SQL queries PARSERS & DEBUGGERS > JWT Debugger: Decode tokens, inspect headers and payloads, verify signatures > Cron Parser: Parse cron expressions with next run calculations > Certificate Decoder: Decode X.509 certificates ENCODERS & DECODERS > Base64: Encode and decode Base64 strings > URL Encoder: Encode, decode, and parse URLs > HTML Encoder: Handle HTML entities > Hash Generator: Generate MD5, SHA-1, SHA-256, SHA-512 hashes > Backslash Escape: Escape and unescape special characters CONVERTERS > Timestamp: Convert Unix epoch timestamps to readable dates > Case Converter: Transform between camelCase, snake_case, UPPER CASE, and more > Color Converter: Convert between HEX, RGB, HSL with live preview > YAML to JSON: Convert between YAML and JSON with tree view > Number Base: Convert between Binary, Octal, Decimal, Hexadecimal > Hex to Text: Convert between hex and ASCII > CSV to JSON: Convert between CSV and JSON GENERATORS > UUID/ULID Generator: Create UUIDs and ULIDs instantly > QR Code: Generate customizable QR codes and export as images > Lorem Ipsum: Generate placeholder text > Random String: Generate secure passwords and API keys TEXT & COMPARISON > Diff Checker: Compare text with highlighted differences > RegEx Tester: Test regex with live match highlighting > Markdown Previewer: Preview Markdown with GitHub Flavored support > Line Sort: Sort and deduplicate lines > String Inspector: Analyze string statistics BUILT FOR MOBILE > Smart History: Auto-saves recent work, stored only on your device > Instant Paste: Smart clipboard detection > Quick Actions: One-tap copy, clear, share > Native Performance: Blazing fast, no loading screens > Light & Dark Modes: Beautiful design for any environment WHO IT'S FOR > Software engineers debugging away from a desk > Site reliability engineers checking cron schedules and certificates during an incident > Backend developers inspecting tokens and payloads > Engineering managers reviewing a diff or a config between meetings > Anyone who needs dev tools without a network PRICING Pro: $9.99/month or $39.99/year (save 67%) 3-day free trial. Cancel anytime. WHY DEVKIT > Works with no connection > Your work never leaves the device > Fast, native performance > Regular updates with new tools > No ads, ever > Built by a developer, for developers Download DevKit and take your tools anywhere. Terms of Use: Apple's Standard EULA (https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)

Paste a JSON blob — an API response, a config file, a log payload — and JSONView turns it into a collapsible, colour-coded tree the moment it lands. Validate it with an error that names the exact line and column, format or minify it, and copy it back out. Everything happens on your iPhone, offline, so your payload never touches a web tool. Most JSON apps wrap the same lenient system parser. JSONView ships its own strict RFC 8259 engine: it preserves your key order instead of scrambling it, keeps number literals exactly as written, rejects the trailing commas other parsers silently swallow, and warns you about duplicate keys — with the position of both copies. WHAT YOU GET • Paste an API response and read it as a collapsible tree in under a second, with keys, strings, numbers and booleans each in their own colour • Broken JSON tells you exactly where: "Line 14, column 27 — trailing comma before '}'" instead of a shrug • Duplicate keys are flagged with both positions, so the bug that only bites in production gets caught on your phone • Find any key or value in a deep payload and jump to it with its full $.path[3].to.node • One tap copies a value, its path, or the whole document — pretty-printed or minified — to the clipboard • Round-tripping never rewrites your data: key order survives, 1e3 stays 1e3, -0 stays -0 PERFECT FOR • Backend and mobile developers checking an API response away from the desk • QA engineers pinning down exactly which field broke the build • Support and ops engineers reading the log payloads customers send in • Anyone learning what valid JSON actually is, from a parser that explains every rejection WHY NOT JUST A WEB FORMATTER? Every browser JSON tool means pasting your payload — auth tokens, emails, customer records — into someone else's server. JSONView parses entirely on-device and works in airplane mode. It also opens .json files straight from Files, Mail or Slack, so you skip the copy-paste dance entirely. PRIVATE BY DEFAULT No network calls. No account. Your documents are parsed and stored only on your iPhone, and your saved library never leaves the device. FULL ACCESS JSONView Pro unlocks the complete toolkit: an unlimited saved-document library, minify to clipboard, .json file export, custom indent width, and A-to-Z key sorting. Choose a weekly plan, a yearly plan, or a one-time lifetime purchase. Weekly and yearly plans are auto-renewing subscriptions; lifetime is a single payment. Copy a JSON payload, open JSONView, and tap Paste — the tree is already waiting. Terms of Use: https://leanstudio.asia/terms-of-use Privacy Policy: https://leanstudio.asia/privacy-policy Support: support@leanstudio.asia